There are 3L, 6.8L, 9L, and 12L sets available according to water volume The gas cylinder adopts a four layer composite structure design, which is lightweight, sturdy, and not easy to burst. Polycarbonate spherical full face cover, with a wide field of view. Backboard conforms to ergonomic design Used in industries such as chemical, petroleum, smelting, warehousing, laboratories, etc., it can safely and effectively carry out firefighting, emergency rescue, disaster relief, and first aid work.